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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33773d3573cc7c24930b384191e535c5174530ef6991dda19ea86b39c2dc7ff2' 
  AND token = 'iQly9Fvj45zctJqMgiNQk/ZlESRBKOYy1VlRl8qutb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}